Help me with this "pop up" scenario, please...

The scenario :
1. I've made 1 div "pop up" that hidden.
2. When visitor leaving my page or click on link to other sites, div "pop up" set to visible asking visitor to leave or visiting another page that I've set before
3. When div "pop up" appear, all process "paused". Similar when

Code:

alert()

in javacript, its will pause all event and then continue when user click OK button.

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